8 HBr (aq) + H2SO4 (aq) → 4 Br2 (aq) + 4 H2O (l) + H2S (g)
This is an oxidation-reduction (redox) reaction:
8 Br-I - 8 e- → 8 Br0 (oxidation)
SVI + 8 e- → S-II (reduction)
HBr is a reducing agent, H2SO4 is an oxidizing agent.
This is a gas evolution reaction, H2S is the formed gas.
Reactants:
Products:
- Br2
- H2O – Water, oxidane
- H2S – Hydrogen sulfide
- Other names: D , Ihydrogen monosulfide|Dihydrogen sulfide|Sewer gas|Sulfane|Sulfurated hydrogen|Sulfureted hydrogen|Sulfuretted hydrogen|Sulfur hydride|Hydrosulfuric acid|Hydrothionic acid|Thiohydroxic acid|Sulfhydric acid}} , Hydrosulfuric acid
- Appearance: Colorless gas ; Colourless compressed liquefied gas with characteristic odour of rotten eggs ; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.]